Processes for the production of fluoropropanes and halopropenes and azeotropic compositions of 2-chloro-3,3,3-trifluoro-1-propene with hf and of 1,1,1,2,2-pentafluoropropane with hf

ABSTRACT

A process is disclosed for making CF 3 CH 2 CHF 2 , CF 3 CH═CHF and/or CF 3 CH═CHCl. The process involves reacting at least one starting material selected from the group consisting of halopropanes of the formula CX 3 CHClCH 2 X, halopropenes of the formula CX 3 CCl═CH 2  and halopropenes of the formula CX 2 ═CClCH 2 X, wherein each X is independently F or Cl, with HF in a reaction zone to produce a product mixture comprising HF, HCl, CF 3 CH 2 CHF 2 , CF 3 CH═CHF and CF 3 CH═CHCl; and recovering the CF 3 CH 2 CHF 2 , CF 3 CH═CHF and/or CF 3 CH═CHCl from the product mixture. Also disclosed is a process for making CF 3 CF 2 CH 3  and/or CF 3 CF═CH 2 . The process involves reacting at least one starting material selected from the group consisting of halopropanes of the formula CX 3 CHClCH 2 X, halopropenes of the formula CX 3 CCl═CH 2  and halopropenes of the formula CX 2 ═CClCH 2 X, wherein each X is independently F or Cl, with HF in a reaction zone to produce a product mixture comprising HF, HCl, CF 3 CF 2 CH 3  and CF 3 CF═CH 2 ; and recovering the CF 3 CF 2 CH 3  and/or CF 3 CF═CH 2  from the product mixture. In each of the processes the molar ratio of HF to total amount of starting material fed to the reaction zone is at least stoichiometric. Also disclosed is an azeotropic composition comprising CF 3 CCl═CH 2 , and HF. Also disclosed is an azeotropic composition comprising CF 3 CF 2 CH 3 , and HF.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a division of application Ser. No. 12/444,470 filedApr. 6, 2009, which represents a national filing under 35 U.S.C. 371 ofInternational Application No. PCT/US2007/022994 filed Oct. 31, 2007, andclaims priority of U.S. Provisional Application No. 60/855,540 filedOct. 31, 2006.

FIELD OF THE INVENTION

The present invention relates to processes for the production of1,1,1,2,2-pentafluoropropane, 2,3,3,3-tetrafluoro-1-propene,1,1,1,3,3-pentafluoropropane, 1,3,3,3-tetrafluoro-1-propene,2-chloro-3,3,3-trifluoro-1-propene and/or1-chloro-3,3,3-trifluoro-1-propene.

BACKGROUND OF THE INVENTION

As a result of the Montreal Protocol phasing out ozone depletingchlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs),industry has been working for the past few decades to find replacementrefrigerants. The solution for most refrigerant producers has been thecommercialization of hydrofluorocarbon (HFC) refrigerants. The newhydrofluorocarbon refrigerants, HFC-134a being the most widely used atthis time, have zero ozone depletion potential and thus are not affectedby the current regulatory phase out as a result of the MontrealProtocol. The production of other hydrofluorocarbons for use inapplications such as solvents, blowing agents, cleaning agents, aerosolpropellants, heat transfer media, dielectrics, fire extinguishants andpower cycle working fluids has also been the subject of considerableinterest.

There is also considerable interest in developing new refrigerants withreduced global warming potential for the mobile air-conditioning market.

1,1,1,3,3-Pentafluoropropane (CF₃CH₂CHF₂ or HFC-245fa), a refrigerantand blowing agent, may be prepared by fluorination of1,1,1,3,3-pentachloropropane (CCl₃CH₂CHCl₂ or HCC-240fa) in the liquidphase (see for example, U.S. Pat. No. 6,291,730).

1,1,1,2,2-Pentapropane (CF₃CF₂CH₃ or HFC-245cb), useful as a refrigerantand blowing agent has been prepared by the addition of methyl fluorideto tetrafluoroethylene in the presence of antimony pentafluoride asdisclosed in U.S. Pat. No. 6,184,426.

2,3,3,3-Tetrafluoro-1-propene (CF₃CF═CH₂ or HFC-1234yf), useful as arefrigerant and as a polymer intermediate has been prepared byfluorination of CH₃CF₂CCl₃ over chromium oxide as disclosed by Rausch inU.S. Pat. No. 2,996,555.

1-Chloro-3,3,3-trifluoro-1-propene (CF₃CH═CHCl or HCFC-1233zd) is usefulas a chemical intermediate and may be prepared by fluorination ofHCC-240fa as disclosed in U.S. Pat. No. 6,013,846.

1,3,3,3-Tetrafluoro-1-propene (CF₃CH═CHF or HFC-1234ze) useful as arefrigerant has been prepared by dehydrofluorination of HFC-245fa usinga strong base in aqueous or alcoholic solution or by means ofchromium-containing catalyst in the presence of oxygen at elevatedtemperature as disclosed in U.S. Pat. No. 6,124,510, and fromHCFC-1233zd as disclosed in U.S. Pat. No. 5,895,825. HFC-1234ze has alsobeen prepared from HCC-240fa as disclosed in U.S. Pat. No. 6,111,150.

2-Chloro-3,3,3-trifluoro-1-propene (CF₃CCl═CH₂ or HCFC-1233xf) is usefulas an intermediate and as a monomer for polymers. HCFC-1233xf has beenprepared by dehydrochlorination of 1,2-dichloro-3,3,3-trifluoropropaneusing potassium hydroxide as described by Haszeldine in Journal of theChemical Society (1951) pages 2495 to 2504.

There is a need for processes for the manufacture of a compound from thegroup HCFC-1233xf, HFC-245fa, HFC-245cb, HFC-1234ze, HCFC-1233zd, andHFC-1234yf, where other compounds of the group are also produced fromcommon halogenated hydrocarbon starting materials and those othercompounds can, if desired, also be recovered.

SUMMARY OF THE INVENTION

The present invention provides a process for making at least one productcompound selected from the group consisting of CF₃CF₂CH₃, CF₃CF═CH₂ andCF₃CCl═CH₂. The process comprises reacting at least one startingmaterial selected from the group consisting of halopropanes of theformula CX₃CHClCH₂X, halopropenes of the formula CClX₂CCl═CH₂ andhalopropenes of the formula CX₂═CClCH₂X, wherein each X is independentlyselected from the group consisting of F and Cl, with HF in a reactionzone, optionally in the presence of a fluorination catalyst, to producea product mixture comprising HF, HCl, CF₃CF₂CH₃, CF₃CF═CH₂ andCF₃CCl═CH₂, wherein the molar ratio of HF to total amount of startingmaterial fed to the reaction zone is at least stoichiometric; andrecovering said at least one product compound from the product mixture.

The present invention also provides a process for making at least oneproduct compound selected from the group consisting of CF₃CH₂CHF₂,CF₃CH═CHF and CF₃CH═CHCl. The process comprises reacting at least onestarting material selected from the group consisting of halopropanes ofthe formula CX₃CHClCH₂X, halopropenes of the formula CX₃CCl═CH₂ andhalopropenes of the formula CX₂═CClCH₂X, wherein each X is independentlyselected from the group consisting of F and Cl, with HF in a reactionzone, optionally in the presence of a fluorination catalyst, to producea product mixture comprising HF, HCl, CF₃CH₂CHF₂, CF₃CH═CHF andCF₃CH═CHCl, wherein the molar ratio of HF to total amount of startingmaterial fed to the reaction zone is at least stoichiometric; andrecovering said at least one product compound from the product mixture.

The present invention also provides a process for making at least oneproduct compound selected from the group consisting of CF₃CF₂CH₃ andCF₃CF═CH₂. The process comprises reacting at least one starting materialselected from the group consisting of halopropanes of the formulaCX₃CHClCH₂X, halopropenes of the formula CX₃CCl═CH₂ and halopropenes ofthe formula CX₂═CClCH₂X, wherein each X is independently selected fromthe group consisting of F and Cl, with HF in a reaction zone, optionallyin the presence of a fluorination catalyst, to produce a product mixturecomprising HF, HCl, CF₃CF₂CH₃ and CF₃CF═CH₂, wherein the molar ratio ofHF to total amount of starting material fed to the reaction zone is atleast stoichiometric; and recovering said at least one product compoundfrom the product mixture.

The present invention also provides azeotropic compositions. Acomposition is provided that comprises CF₃CCl═CH₂ and HF; wherein the HFis present in an effective amount to form an azeotropic combination withthe CF₃CCl═CH₂. Another composition is provided that comprises CF₃CF₂CH₃and HF; wherein the HF is present in an effective amount to form anazeotropic combination with the CF₃CF₂CH₃.

DETAILED DESCRIPTION

The term “starting material”, as used herein, means halopropanes orhalopropenes which react with hydrogen fluoride (HF) in a reaction zonein the embodiments of this invention. As indicated above, for certainprocesses of this invention, the starting material is selected from thegroup consisting of halopropanes of the formula CX₃CHClCH₂X,halopropenes of the formula CClX₂CCl═CH₂ and halopropenes of the formulaCX₂═CClCH₂X, wherein each X is independently selected from the groupconsisting of F and Cl; and for certain other processes of thisinvention, the starting material is selected from the group consistingof halopropanes of the formula CX₃CHClCH₂X, halopropenes of the formulaCX₃CCl═CH₂ and halopropenes of the formula CX₂═CClCH₂X, wherein each Xis independently selected from the group consisting of F and Cl.

The processes of this invention use a molar ratio of HF to the totalamount of starting material that is at least stoichiometric. Thestoichiometric ratio is determined by subtracting the weighted averageof the number of fluorine substituents in the starting material(s) fromthe weighted average of the number of fluorine substituents in thedesired product(s). For example, for producing a C₃H₃F₅ isomer fromC₃H₃Cl₅, the stoichiometric ratio of HF to C₃H₃Cl₅ is 5:1. As anotherexample, for producing a 1:1 mixture of HFC-245cb to HFC-1234yf fromCF₃CCl═CH₂, the stoichiometric ratio of HF to CF₃CCl═CH₂ is 1.5:1.

Certain compounds produced by the processes of this invention may existas one of two configurational isomers. For example, HFC-1234ze andHCFC-1233zd may each exist as E- or Z-isomers. As used herein HFC-1234zerefers to the isomers, E-HFC-1234ze or Z-HFC-1234ze, as well as anycombinations or mixtures of such isomers; and HCFC-1233zd as used hereinrefers to the isomers, E-HCFC-1233zd or Z-HCFC-1233zd, as well as anycombinations or mixtures of such isomers.

As indicated above, the present invention provides a process thatinvolves producing a product mixture comprising at least one productcompound selected from the group consisting of HFC-245cb, HFC-1234yf andHCFC-1233xf using at least one starting material selected from the groupconsisting of halopropanes of the formula CX₃CHClCH₂X, halopropenes ofthe formula CClX₂CCl═CH₂ and halopropenes of the formula CX₂═CClCH₂X. Ofnote are embodiments of this process wherein HFC-1234yf is recovered.Additional HFC-1234yf may be obtained by dehydrofluorination ofHFC-245cb from the product mixture. Also of note are embodiments of thisprocess wherein HCFC-1233xf from the product mixture is fluorinated toproduce at least one of HFC-1234yf and HFC-245cb.

The product mixture may also comprise HFC-1234ze. The HFC-1234ze may berecovered. The product mixture may further comprise HCFC-1233zd.HFC-1234ze and HFC-245fa may also be obtained by fluorination ofHCFC-1233zd from the product mixture.

The product mixture may also comprise HFC-245fa. The HFC-245fa may berecovered. The HFC-245fa may also be dehydrofluorinated to produceHFC-1234ze.

The product mixture may further comprise HFC-1234ze. A mixture ofHFC-245cb and HFC-1234ze may be recovered and further reacted with HF inthe liquid phase under fluorination conditions in the presence of afluorination catalyst to produce a mixture comprising HFC-245fa andHFC-245cb. Alternatively, a mixture of HFC-245cb and HFC-1234ze may berecovered and further reacted under dehydrofluorination conditions inthe presence of a dehydrofluorination catalyst to produce a mixturecomprising HFC-1234ze and HFC-1234yf.

HFC-245fa, HFC-1234ze and/or HCFC-1233zd may also be present in theproduct mixture. HFC-245cb, HFC-1234yf and HCFC-1233xf from the productmixture together with HFC-245fa (if present), HFC-1234ze (if present)and HCFC-1233zd (if present) may be further reacted with HF in theliquid phase under fluorination conditions in the presence of afluorination catalyst to produce a mixture comprising HFC-245fa andHFC-245cb. The HFC-245fa and HFC-245cb from the mixture may bedehydrofluorinated (individually or as a mixture) to produce bothHFC-1234ze and HFC-1234yf which may be recovered. See for example, U.S.Patent Application Publication US2006/0106263(A1), which is hereinincorporated by reference.

HCFC-1233zd and HFC-245fa may also be present in the product mixture;and HCFC-1233xf, HCFC-1233zd, and HFC-245fa from the product mixture maybe further reacted with HF in the liquid phase under fluorinationconditions in the presence of a fluorination catalyst to produce amixture comprising CF₃CH₂CHF₂ and CF₃CF₂CH₃.

As indicated above, the present invention also provides a process thatinvolves producing a product mixture comprising HFC-245fa, HFC-1234zeand HCFC-1233zd using at least one starting material selected from thegroup consisting of halopropanes of the formula CX₃CHClCH₂X,halopropenes of the formula CX₃CCl═CH₂ and halopropenes of the formulaCX₂═CClCH₂X. Of note are embodiments of the process wherein HFC-1234zeis recovered. Additional HFC-1234ze may be obtained bydehydrofluorination of HFC-245fa from the product mixture. Also of noteare embodiments of this process wherein HCFC-1233zd from the productmixture is fluorinated to produce at least one of HFC-1234ze andHFC-245fa.

Also of note are processes wherein HFC-245fa is recovered.

Also of note are processes wherein the product mixture further comprisesHFC-1234yf and wherein HFC-1234yf from the product mixture is recovered.

The product mixture may further comprise HFC-245cb. A mixture ofHFC-245cb and HFC-1234ze may be recovered and further reacted with HF inthe liquid phase under fluorination conditions in the presence of afluorination catalyst to produce a mixture comprising HFC-245fa andHFC-245cb. Alternatively, a mixture of HFC-245cb and HFC-1234ze may berecovered and further reacted under dehydrofluorination conditions inthe presence of a dehydrofluorination catalyst to produce a mixturecomprising HFC-1234ze and HFC-1234yf.

HFC-245cb, HFC-1234yf and/or HCFC-1233xf may also be present in theproduct mixture. HFC-245fa, HFC-1234ze and HCFC-1233zd from the productmixture together with HFC-245cb (if present), HFC-1234yf (if present)and HCFC-1233xf (if present) may be further reacted with HF in theliquid phase under fluorination conditions in the presence of afluorination catalyst to produce a mixture comprising HFC-245fa andHFC-245cb. The HFC-245fa and HFC-245cb from the mixture may bedehydrofluorinated (individually or as a mixture) to produce bothHFC-1234ze and HFC-1234yf which may be recovered. See for example, U.S.Patent Application Publication US2006/0106263(A1).

HCFC-1233xf may also be present in the product mixture; and HCFC-1233xf,HCFC-1233zd, and HFC-245fa from the product mixture may be furtherreacted with HF in the liquid phase under fluorination conditions in thepresence of a fluorination catalyst to produce a mixture comprisingCF₃CH₂CHF₂ and CF₃CF₂CH₃.

As indicated above, the present invention also provides a process thatinvolves producing a product mixture comprising HFC-245cb and HFC-1234yfusing at least one starting material selected from the group consistingof halopropanes of the formula CX₃CHClCH₂X, halopropenes of the formulaCX₃CCl═CH₂ and halopropenes of the formula CX₂═CClCH₂X. Of note areembodiments of the process wherein HCFC-1233xf is used as a startingmaterial.

Suitable halopropane starting materials of the formula CX₃CHClCH₂Xinclude CCl₃CHClCH₂Cl (HCC-240db) and CF₃CHClCH₂Cl (HCFC-243db).HCFC-243db is a readily available starting material obtained fromchlorination of commercially available CF₃CH═CH₂(3,3,3-trifluoro-1-propene or HFC-1243zf)

Suitable halopropene starting materials of the formula CX₃CCl═CH₂include HCFC-1233xf. HCFC-1233xf can be obtained by thedehydrochlorination of HCFC-243db.

Suitable halopropene starting materials of the formula CX₂═CClCH₂Xinclude CCl₂═CClCH₂Cl.

The reaction may be carried out in the liquid or vapor phase. For liquidphase embodiments of the invention, the reaction of starting materialswith HF may be conducted in a liquid-phase reactor operating in batch,semi-batch, semi-continuous, or continuous modes. In the batch mode,starting materials and HF are combined in an autoclave or other suitablereaction vessel and heated to the desired temperature.

Preferably, this reaction is carried out in semi-batch mode by feedingHF to a liquid-phase reactor containing starting materials or by feedingstarting materials to a liquid-phase reactor containing HF, or byfeeding HF to a mixture containing HF and reaction products formed byinitially heating starting materials and HF. Alternatively, HF may befed to a liquid-phase reactor containing a mixture of starting materialsand reaction products formed by the reaction of HF, and startingmaterials. In another embodiment of the liquid-phase process, HF, andstarting materials may be fed concurrently in the desired stoichiometricratio to the reactor containing a mixture of HF and reaction productsformed by reacting HF, and starting materials.

Suitable temperatures for the reaction of HF with starting materials inthe liquid-phase reactor are from about 80° C. to about 180° C.,preferably from about 100° C. to about 150° C. Higher temperaturestypically result in greater conversion of the starting materials.

A suitable molar ratio of HF to total amount of starting materials fedto the liquid-phase reactor is at least stoichiometric and is typicallyfrom about 5:1 to about 100:1. Of note are embodiments wherein the molarratio of HF to starting material is from about 8:1 to about 50:1.

The reactor pressure in the liquid-phase process is not critical and inbatch reactions is usually the autogenous pressure of the system at thereaction temperature. The pressure of the system increases as hydrogenchloride is formed by replacement of chlorine substituents by fluorinein the starting materials and intermediate reaction products. In acontinuous process it is possible to set the pressure of the reactor insuch a way that the lower boiling products of the reaction, such as HCl,CF₃CF═CH₂, E/Z—CF₃CH═CHF, and CF₃CF₂CH₃, are vented from the reactor,optionally through a packed column or condenser. In this manner, higherboiling intermediates remain in the reactor and the volatile productsare removed. Typical reactor pressures are from about 20 psig (239 kPa)to about 1,000 psig (6,994 kPa).

In embodiments of the invention in which the reaction is conducted usinga liquid-phase process, catalysts which may be used include carbon,AlF₃, BF₃, FeCl_(3-a)F_(a) (where a=0 to 3), FeX₃ supported on carbon,SbCl_(3-a)F_(a), AsF₃, MCl_(5-b)F_(b) (where b=0 to 5 and M=Sb, Nb, Ta,or Mo), and M′Cl_(4-c)F_(c) (where c=0 to 4, and M′═Sn, Ti, Zr, or Hf).Preferred catalysts for the liquid phase process are MCl_(5-b)F_(b)(where b=0 to 5 and M=Sb, Nb, or Ta).

Preferably, the reaction of HF with starting materials is carried out inthe vapor phase. Typically a heated reactor is used. A number of reactorconfigurations are possible including horizontal or vertical orientationof the reactor as well as the sequence of reaction of the startingmaterials with HF. In one embodiment of the invention, the startingmaterials may be initially vaporized and fed to the reactor as gases.

In another embodiment of the invention, the starting materials may becontacted with HF in a pre-reactor prior to reaction in the vapor-phasereactor. The pre-reactor may be empty, but is preferably filled with asuitable packing such as Monel™ or Hastelloy™ nickel alloy turnings orwool, or other material inert to HCl and HF which allows efficientmixing of starting materials and HF vapor.

Suitable temperatures for the pre-reactor for this embodiment of theinvention are from about 80° C. to about 250° C., preferably from about100° C. to about 200° C. Temperatures greater than about 100° C. resultin some conversion of the starting materials to compounds having ahigher degree of fluorination. Higher temperatures result in greaterconversion of the starting materials entering the reactor and a greaterdegree of fluorination in the converted compounds. Under theseconditions, for example, a mixture of HF and HCFC-243db is converted toa mixture containing predominantly HF, HCl, HCFC-243db, HCFC-244db(CF₃CHClCH₂F), and HCFC-1233xf.

The degree of fluorination reflects the number of fluorine substituentsthat replace chlorine substituents in the starting materials and theirfluorinated products. For example, HFC-245cb represents a higher degreeof fluorination than HCFC-243db and HFC-1234yf represents a higherdegree of fluorination than HCFC-1233xf.

The molar ratio of HF to the total amount of starting material(s) in thepre-reactor is typically from about the stoichiometric ratio of HF tothe total amount of starting material to about 50:1. Preferably, themolar ratio of HF to the total amount of starting material in thepre-reactor is from about twice the stoichiometric ratio of HF to thetotal amount of starting material to about 30:1. In one embodiment ofthe invention, the preferred molar ratio of HF to the total amount ofstarting materials is present in the pre-reactor, and no additionalamount of HF is added to the vapor-phase reaction zone.

In a preferred embodiment of the invention, the starting materials andHF are vaporized and fed to a pre-reactor or to a vapor-phase reactor.

Suitable temperatures for the vapor-phase reaction of this invention arefrom about 120° C. to about 500° C. Temperatures in the range of fromabout 300° C. to about 350° C. favor the formation of HFC-1234yf andHFC-245cb and HCFC-1233xf. Temperatures in the range of from about 350°C. to about 450° C. favor the additional formation of HFC-1234ze,HFC-245fa, and HCFC-1233zd. Higher temperatures result in greaterconversion of starting materials and greater degrees of fluorination inthe converted products. If the starting material is the halopropane,reactor temperatures of from about 150° C. to about 275° C. favor theformation of HCFC-1233xf as the major product.

Suitable reactor pressures for the vapor-phase reactor may be from about1 to about 30 atmospheres. A pressure of about 15 to about 25atmospheres may be advantageously employed to facilitate separation ofHCl from other reaction products, and the suitable reaction time mayvary from about 1 to about 120 seconds, preferably from about 5 to about60 seconds.

The molar ratio of HF to the total amount of starting material(s) forthe vapor-phase reaction is typically from about the stoichiometricratio of HF to the total amount of starting material to about 50:1 andpreferably from about 10:1 to about 30:1.

Preferably a catalyst is used in the reaction zone for the vapor-phasereaction of HF with starting materials. Fluorination catalysts which maybe used in the vapor phase reaction of the invention include carbon;graphite; alumina; fluorided alumina; aluminum fluoride; aluminasupported on carbon; aluminum fluoride supported on carbon; fluoridedalumina supported on carbon; magnesium fluoride supported on aluminumfluoride; metals (including elemental metals, metal oxides, metalhalides, and/or other metal salts); metals supported on aluminumfluoride; metals supported on fluorided alumina; metals supported onalumina; and metals supported on carbon; mixtures of metals.

Suitable metals for use as catalysts (optionally supported on alumina,aluminum fluoride, fluorided alumina, or carbon) include chromium, iron,cobalt, nickel, ruthenium, rhodium, palladium, osmium, iridium,platinum, manganese, rhenium, scandium, yttrium, lanthanum, titanium,zirconium, and hafnium, copper, silver, gold, zinc, and/or metals havingan atomic number of 58 through 71 (i.e., the lanthanide metals).Preferably when used on a support, the total metal content of thecatalyst will be from about 0.1 to about 20 percent by weight based onthe total weight of the catalyst; typically from about 0.1 to about 10percent by weight based on the total weight of the catalyst.

Typical fluorination catalysts for the vapor-phase reactions in thisinvention include chromium-containing catalysts including chromium(III)oxide (Cr₂O₃); Cr₂O₃ with other metals such as magnesium halides or zinchalides supported on Cr₂O₃; chromium(III) halides supported on carbon;mixtures of chromium and magnesium (including elemental metals, metaloxides, metal halides, and/or other metal salts) optionally supported ongraphite; and mixtures of chromium and other metals (including elementalmetals, metal oxides, metal halides, and/or other metal salts)optionally supported on graphite, alumina, or aluminum halides such asaluminum fluoride.

Chromium-containing catalysts are well known in the art. They may beprepared by either precipitation methods or impregnation methods asgenerally described by Satterfield on pages 87-112 in HeterogeneousCatalysis in Industrial Practice, 2^(nd) edition (McGraw-Hill, New York,1991).

Of note are fluorination catalysts that comprise at least onechromium-containing component selected from the group consisting ofcrystalline alpha-chromium oxide where from about 0.05 atom % to about 6atom % of the chromium atoms in the alpha-chromium oxide lattice arereplaced by trivalent cobalt atoms, and crystalline alpha-chromium oxidewhere from about 0.05 atom % to about 6 atom % of the chromium atoms inthe alpha-chromium oxide lattice are replaced by trivalent cobalt atomswhich has been treated with a fluorinating agent. These catalysts,including their preparation, have been disclosed in U.S. PatentApplication Publication US2005/0228202 which is incorporated herein byreference in its entirety.

Optionally, the metal-containing catalysts described above can bepretreated with HF. This pretreatment can be accomplished, for example,by placing the metal-containing catalyst in a suitable container, andthereafter, passing HF over the metal-containing catalyst. In oneembodiment of this invention, such container can be the reactor used toperform the fluorination reaction in this invention. Typically, thepretreatment time is from about 15 to about 300 minutes, and thepretreatment temperature is from about 200° C. to about 450° C.

In one embodiment of this invention, the product mixture comprisesHFC-245cb, HFC-245fa, HFC-1234yf, HFC-1234ze, HCFC-1233zd andHCFC-1233xf.

In cases where the product mixture produced by the processes of thisinvention comprises (i) product compounds HFC-245cb, HFC-245fa,HFC-1234yf, HFC-1234ze, HCFC-1233zd and HCFC-1233xf, (ii) HF and HCl,(iii) by-products and (iv) unreacted starting materials, the separationsteps (a) through (e) may be employed to recover the product compoundsfrom such a product mixture.

In separation step (a), the product mixture may be delivered to adistillation column to separate HCl from the product mixture.

In separation step (b), the product mixture from separation step (a) maybe delivered to one or more distillation columns to separate theazeotropic composition of HFC-1234yf and HF from the rest of the productmixture. The recovered azeotropic composition of HFC-1234yf and HF maybe further separated into individual components by using proceduressimilar to those described in U.S. Patent Application PublicationUS2006/0106263(A1) that is incorporated herein by reference.

In separation step (c), the product mixture from separation step (b) maybe delivered to one or more distillation columns in which HF, HFC-245cb,HFC-1234ze, HCFC-1233xf, HCFC-1233zd, and HFC-245fa are recovered fromthe top of the distillation column, and the higher boiling startingmaterials such as CF₃CHClCH₂C₁, CF₃CHClCH₂F are removed from the bottomof the distillation column. The CF₃CHClCH₂C₁ and CF₃CHClCH₂F may befurther separated from other by-products and unreacted startingmaterials, e.g. by distillation, and may be recycled back to thevapor-phase fluorination reactor.

In separation step (d), the product mixture comprising HF, HFC-245cb,HFC-1234ze, HCFC-1233xf, HCFC-1233zd and HFC-245fa, which is recoveredfrom the top of the distillation column in separation step (c), may bedelivered to one or more distillation columns to recover the azeotropiccomposition of HFC-245cb/HF and the azeotropic composition ofHFC-1234ze/HF from the top of the distillation column. The recoveredHFC-245cb/HF and HFC-1234ze/HF azeotropic compositions may then befurther separated into individual components by using procedures similarto those described in U.S. Patent Application PublicationUS2006/0106263(A1).

In yet another embodiment of the separation step (d), the productmixture comprising HF, HFC-245cb, HFC-1234ze, HCFC-1233xf, HCFC-1233zdand HFC-245fa, which is recovered from the top of the distillationcolumn in separation step (c), may be recycled back to the reaction zoneof the vapor phase fluorination reactor.

In separation step (e), the product mixture comprising HCFC-1233xf,HCFC-1233zd and HFC-245fa and any HF recovered from the bottom of thedistillation column in separation step (d) may be delivered to adistillation column to separate the HCFC-1233xf, HCFC-1233zd andHFC-245fa. The HCFC-1233xf can be fluorinated to produce at least one ofHFC-245cb and HFC-1234yf. The HCFC-1233zd can be fluorinated to produceat least one of HFC-245fa and HFC-1234ze.

In isolating HCFC-1233xf in separation step (e), it is observed thatHCFC-1233xf forms an azeotrope with HF.

As indicated above, in certain embodiments of this invention, themixture of HF, HFC-245cb and HFC-1234ze, made according to the processof the invention is contacted with additional HF in a liquid-phasefluorination reactor, optionally in the presence of a liquid-phasefluorination catalyst to give a mixture of HF, HFC-245cb and HFC-245fa.The mixture of HF, HFC-245cb, and HFC-245fa is then separated into theindividual components by using procedures similar to those described inU.S. Patent Application Publication US2006/0106263(A1). Suitablefluorination catalysts for these embodiments may be selected from thosedescribed for the liquid-phase embodiment of the fluorination reactordescribed herein. The mole ratio of HF to HFC-245cb and HFC-1234ze inthese embodiments is typically from about 5:1 to about 100:1, and ispreferably from about 10:1 to about 40:1 based on the amount ofHFC-1234ze in the mixture. Suitable temperatures for these embodimentsof the invention are within the range of from about 30° C. to about 180°C., preferably from about 50° C. to about 150° C. Suitable reactorpressures for these embodiments are usually the autogenous pressures atthe reactor temperatures. The pressure may be in the range of from about1 to about 30 atmospheres.

As indicated above, in certain embodiments of this invention, a mixtureof HF, HFC-245cb and HFC-1234ze, made according to the processes of thisinvention, may be delivered to a reaction zone containing adehydrofluorination catalyst (optionally after removal of the HF).Conditions in the reaction zone are chosen to be suitable for conversionof HFC-245cb to HFC-1234yf. The products leaving the reactor, comprisingHFC-1234ze and HFC-1234yf are separated by techniques known to the art.Catalysts suitable for these embodiments of the invention and suitableoperating conditions are disclosed in U.S. Pat. No. 5,396,000 theteachings of which are herein incorporated by reference. Preferably, thedehydrofluorination catalyst comprises aluminum fluoride or fluoridedalumina or trivalent chromium oxide. Reaction temperatures suitable forthese embodiments are from about 150° C. to about 500° C. Contact timesin the reaction zone for these embodiments are typically from about 1second to about 500 seconds.

As indicated above, in certain embodiments of this invention, a mixtureof HCFC-1233xf, HCFC-1233zd, and HFC-245fa made according to the processof the invention, is reacted with HF in a liquid-phase fluorinationreactor in the presence of a liquid-phase fluorination catalyst to givea mixture of HF, HFC-245cb and HFC-245fa. The conditions of thefluorination are similar to those described for the mixture ofHFC-1234ze and HFC-245cb above. The mixture of HF, HFC-245cb, andHFC-245fa is then optionally delivered to a distillation column toseparate the two pentafluoropropanes and azeotropic HF by usingprocedures similar to those described in U.S. Patent ApplicationPublication US2006/0106263(A1).

As noted above, HFC-245cb, made according to the processes of thisinvention, may be dehydrofluorinated to produce HFC-1234yf, andHFC-245fa, made according to the processes of this invention, may bedehydrofluorinated to produce HFC-1234ze. Typical dehydrofluorinationreaction conditions and dehydrofluorination catalysts are disclosed inU.S. Pat. No. 5,396,000, which is herein incorporated by reference.Dehydrofluorination reaction temperatures suitable for this inventionare from about 150° C. to about 500° C.; however, higher temperature aredesirable for the dehydrofluorination of HFC-245cb. Suitable contacttimes for these dehydrofluorinations are from about 1 second to about500 seconds. Preferably, the dehydrofluorination catalyst comprises atleast one catalyst selected from the group consisting of aluminumfluoride, fluorided alumina, and trivalent chromium oxide.

As indicated above, in certain embodiments of this invention, a mixtureof HFC-245cb, HFC-1234yf, HFC-1234ze, HCFC-1233xf, HCFC-1233zd, andHFC-245fa that are present in the product mixtures made according to theprocesses of the invention, is reacted with HF in a liquid-phasefluorination reactor in the presence of a liquid-phase fluorinationcatalyst. The conditions of the fluorination are similar to thosedescribed for the mixture of HFC-1234ze and HFC-245cb above. Thefluorination catalysts for the above liquid-phase embodiments of theinvention may be selected from those described for the liquid-phaseembodiment the fluorination reactor described herein.

The amount of HF required for the liquid-phase reaction is determined bythe total amount of HFC-1234yf, HFC-1234ze, HCFC-1233xf, andHCFC-1233zd, present in the mixture. The mole ratio of HF to the sum ofthe moles of HFC-1234yf, HFC-1234ze, HCFC-1233xf, and E/Z-HCFC-1233zd istypically from about the stoichiometric amount (between 1:1 to 2:1) toabout 100:1, and is preferably from about 8:1 to about 50:1. Suitabletemperatures for these embodiments of the invention are typically withinthe range of from about 30° C. to about 180° C., preferably from about50° C. to about 150° C. The resulting mixture of pentafluoropropanes(i.e, HFC-245cb and HFC-245fa) may be then be freed of HF and recoveredas individual compounds by techniques known to the art.

In connection with developing processes for the separation of theindividual compounds produced from the fluorination reactions in thisinvention, it is noted that HCFC-1233xf can be present as an azeotropewith HF and that HFC-245cb can be present as an azeotrope with HF.

The present invention also provides azeotrope compositions comprising aneffective amount of hydrogen fluoride combined with HCFC-1233xf. Byeffective amount of hydrogen fluoride is meant an amount of hydrogenfluoride, which, when combined with HCFC-1233xf, results in theformation of an azeotropic mixture.

The present invention also provides azeotrope compositions comprising aneffective amount of hydrogen fluoride combined with HFC-245cb. Byeffective amount of hydrogen fluoride is meant an amount of hydrogenfluoride, which, when combined with HFC-245cb, results in the formationof an azeotropic mixture.

As recognized in the art, an azeotrope composition is an admixture oftwo or more different components which, when in liquid form under agiven pressure, will boil at a substantially constant temperature, whichtemperature may be higher or lower than the boiling temperatures of theindividual components, and which will provide a vapor compositionessentially identical to the liquid composition undergoing boiling.

Accordingly, the essential features of an azeotrope composition are thatat a given pressure, the boiling point of the liquid composition isfixed and that the composition of the vapor above the boilingcomposition is essentially that of the boiling liquid composition (i.e.,no fractionation of the components of the liquid composition takesplace). It is also recognized in the art that both the boiling point andthe weight percentages of each component of the azeotrope compositionmay change when the azeotrope composition is subjected to boiling atdifferent pressures. Thus, an azeotrope composition may be defined interms of the unique relationship that exists among the components or interms of the compositional ranges of the components or in terms of exactweight percentages of each component of the composition characterized bya fixed boiling point at a specified pressure. It is also recognized inthe art that various azeotrope compositions (including their boilingpoints at particular pressures) may be calculated (see, e.g., W. SchotteInd. Eng. Chem. Process Des. Dev. (1980) 19, 432-439). Experimentalidentification of azeotrope compositions involving the same componentsmay be used to confirm the accuracy of such calculations and/or tomodify the calculations at the same or other temperatures and pressures.

In accordance with this invention, compositions are provided whichcomprise the HCFC-1233xf and HF, wherein the HF is present in aneffective amount to form an azeotropic combination with the HCFC-1233xf.According to calculations, these compositions comprise from about 71mole percent to about 60 mole percent HF and from about 29 mole percentto about 40 mole percent HCFC-1233xf (which form azeotropes boiling at atemperature of from between about 0° C. and about 100° C. and at apressure of from between about 14.3 psi (98.6 kPa) and about 277 psi(1907 kPa)).

Compositions may be formed that consist essentially of azeotropecombinations of hydrogen fluoride with HCFC-1233xf. These includecompositions calculated to consist essentially of from about 71 molepercent to about 60 mole percent HF and from about 29 mole percent toabout 40 mole percent HCFC-1233xf (which form azeotropes boiling at atemperature of from between about 0° C. and about 100° C. and at apressure of from between about 14.3 psi (98.6 kPa) and about 277 psi(1907 kPa)).

Subsequent to these calculations, it has been confirmed based onexperiments that azeotropes of HCFC-1233xf and HF are formed at avariety of temperatures and pressures. For example, an azeotrope of HFand HCFC-1233xf at 29.84° C. and 45.8 psi (315.9 kPa) has been found toconsist essentially of about 68.4 mole percent HF and about 31.6 molepercent HCFC-1233xf. An azeotrope of HF and HCFC-1233xf at 54.74° C. and96.7 psi (666.9 kPa) has been calculated to consist essentially of about66.6 mole percent HF and about 33.4 mole percent HCFC-1233xf. Anazeotrope of HF and HCFC-1233xf at 79.67° C. and 186.2 psi (1284.1 kPa)has been calculated to consist essentially of about 63.3 mole percent HFand about 36.7 mole percent HCFC-1233xf.

According to calculations based on the experiments, azeotropiccompositions are provided that comprise from about 71.7 mole percent toabout 60.2 mole percent HF and from about 28.3 mole percent to about39.8 mole percent HCFC-1233xf (which form azeotropes boiling at atemperature of from between about 0° C. and about 100° C. and at apressure of from between about 15.1 psi (104.1 kPa) and about 306.3 psi(2112.4 kPa)). Also provided are compositions consisting essentially offrom about 71.7 mole percent to about 60.2 mole percent HF and fromabout 28.3 mole percent to about 39.8 mole percent HCFC-1233xf (whichforms an azeotrope boiling at a temperature from between about 0° C. andabout 100° C. and at a pressure of from between about 15.1 psi (104.1kPa) and about 306.3 psi (2112.4 kPa)).

Azeotropic compositions of HF and HCFC-1233xf are useful as sources ofHF to fluorinate other halogenated or unsaturated compounds. Such afluorination, for example, can be carried out in the liquid-phase usingconventional antimony pentahalide catalysts known to the art or in thevapor-phase using chromium oxide catalysts also known to the art.Further, the azeotropic composition of HF and HCFC-1233xf is also usefulas a recycle stream to the fluorination reactor where both the recycledHF and HCFC-1233xf components can function as reactants. For example, asshown above, HCFC-1233xf can be used as a starting material forHFC-1234yf.

In accordance with this invention, compositions are also provided whichcomprise the HFC-245cb and HF, wherein the HF is present in an effectiveamount to form an azeotropic combination with the HFC-245cb. Accordingto calculations based on experiments, these compositions comprise fromabout 25.4 mole percent to about 39.5 mole percent HF and from about74.6 mole percent to about 60.5 mole percent HFC-245cb (which formazeotropes boiling at a temperature of from between about −40° C. andabout 90° C. and at a pressure of from between about 5.6 psi (38.6 kPa)and about 413.0 psi (2848.3 kPa)).

Compositions may be formed that consist essentially of azeotropecombinations of hydrogen fluoride with HFC-245cb. These includecompositions consisting essentially of from about 25.4 mole percent toabout 39.5 mole percent HF and from about 74.6 mole percent to about60.5 mole percent HFC-245cb (which form azeotropes boiling at atemperature of from between about −40° C. and about 90° C. and at apressure of from between about 5.6 psi (38.6 kPa) and about 413.0 psi(2848.3 kPa)).

It has been determined based on experiments and calculations based onexperiments that azeotropes of HFC-245cb and HF are formed at a varietyof temperatures and pressures. For example, an azeotrope of HF andHFC-245cb at −20° C. and 14.7 psi (101.4 kPa) has been calculated toconsist essentially of about 30.2 mole percent HF and about 69.8 molepercent HFC-245cb. An azeotrope of HF and HFC-245cb at 0° C. and 33.2psi (229.0 kPa) has been calculated to consist essentially of about 33.3mole percent HF and about 66.7 mole percent HFC-245cb. An azeotrope ofHF and HFC-245cb at 19.87° C. and 65.7 psi (453.1 kPa) has been found toconsist essentially of about 36.5 mole percent HF and about 63.5 molepercent HFC-245cb. An azeotrope of HF and HFC-245cb at 40° C. and 119.4psi (823.4 kPa) has been calculated to consist essentially of about 38.6mole percent HF and about 61.4 mole percent HFC-245cb. An azeotrope ofHF and HFC-245cb at 59.65° C. and 200.3 psi (1381.4 kPa) has been foundto consist essentially of about 39.6 mole percent HF and about 60.4 molepercent HFC-245cb.

Azeotropic compositions of HF and HFC-245cb are useful as sources of HFto fluorinate other halogenated or unsaturated compounds. Such afluorination, for example, can be carried out in the liquid-phase usingconventional antimony pentahalide catalysts known to the art or in thevapor-phase using chromium oxide catalysts also known to the art. Forexample, contacting an azeotropic mixture of HF and HFC-245cb withacetylene, optionally in the presence of a catalyst such as carbon, willgive a mixture of HFC-245cb and HFC-152a (CH₃CHF₂) by fluorination ofacetylene. Further, the azeotropic composition of HF and HFC-245cb isalso useful as a recycle stream to the fluorination reactor where therecycled HF functions as a reactant. For example, azeotropiccompositions of HF and HFC-245cb may serve as a source of HF byrecycling to the reaction zone of this invention followed by contactingwith halopropanes of the formula CX₃CHClCH₂X, halopropenes of theformula CClX₂CCl═CH₂ and/or halopropenes of the formula CX₂═CClCH₂X, asdefined above.

The reactor, distillation columns, and their associated feed lines,effluent lines, and associated units used in applying the process ofthis invention should be constructed of materials resistant to hydrogenfluoride and hydrogen chloride. Typical materials of construction,well-known to the fluorination art, include stainless steels, inparticular of the austenitic type, the well-known high nickel alloys,such as Monel™ nickel-copper alloys, Hastelloy™ nickel-based alloys and,Inconel™ nickel-chromium alloys, and copper-clad steel.

Without further elaboration, it is believed that one skilled in the artcan, using the description herein, utilize the present invention to itsfullest extent. The following specific embodiments are, therefore, to beconstrued as merely illustrative, and do not constrain the remainder ofthe disclosure in any way whatsoever.

EXAMPLES Preparation of 98% Chromium/2% Cobalt Catalyst

A solution of 784.30 g Cr(NO₃)_(3[)9(H₂O)] (1.96 moles) and 11.64 gCo(NO₃)_(2[)6(H₂O)] (0.040 mole) was prepared in 2000 mL of deionizedwater. The solution was treated dropwise with 950 mL of 7.4M aqueousammonia until the pH reached about 8.5. The slurry was stirred overnightat room temperature and then evaporated to dryness in air at 110-120° C.The dried catalyst was then calcined in air at 400° C. for 24 hoursprior to use.

General Procedure for Product Analysis

The following general procedure is illustrative of the method used foranalyzing the products of fluorination reactions. Part of the totalreactor effluent was sampled on-line for organic product analysis usinga gas chromatograph equipped a mass selective detector (GC/MS). The gaschromatography utilized a 20 ft. (6.1 m) long×⅛ in. (0.32 cm) diametertube containing Krytox® perfluorinated polyether on an inert carbonsupport. The helium flow was 30 mL/min (5.0×10⁻⁷ m³/sec). Gaschromatographic conditions were 60° C. for an initial hold period ofthree minutes followed by temperature programming to 200° C. at a rateof 6° C./minute.

LEGEND 243db is CF₃CHClCH₂Cl 244db is CF₃CHClCH₂F 245cb is CF₃CF₂CH₃245fa is CF₃CH₂CHF₂ 1234yf is CF₃CF═CH₂ 1233xf is CF₃CCl═CH₂ 1233zd isE— and Z—CHCl═CHCF₃ 1234ze is E— and Z—CHF═CHCF₃ 1243zf is CH₂═CHCF₃

Examples 1-5 Fluorination of CF₃CHClCH₂Cl

The 98% chromium/2% cobalt catalyst prepared above (21.4 g, 15 mL, −12to +20 mesh, (1.68 to 0.84 mm)) was placed in a ⅝″ (1.58 cm) diameterInconel™ nickel alloy reactor tube heated in a fluidized sand bath. Thecatalyst was pre-fluorinated by treatment with HF as follows. Thecatalyst was heated from 45° C. to 175° C. in a flow of nitrogen (50cc/min) over the course of about 1.5 h. HF was then admitted to thereactor at a flow rate of 50 cc/min for 1.3 h at a temperature of 175°C. The reactor nitrogen flow was decreased to 20 cc/min and the HF flowincreased to 80 cc/min; this flow was maintained for 0.3 h. The reactortemperature was then gradually increased to 400° C. over 1 h. After thisperiod, the HF and nitrogen flow was stopped and the reactor brought tothe desired operating temperature. A flow of HF vapor and CF₃CHClCH₂Clwas then started through the reactor. Part of the reactor effluent wasanalyzed by on line GC/MS.

The results of the fluorination of CF₃CHClCH₂Cl over the 98/2 Cr/Cocatalyst at various operating temperatures and indicated molar ratios ofHF and CF₃CHClCH₂Cl are shown in Table 1; analytical data is given inunits of GC area %. The nominal catalyst bed volume was 15 cc; thecontact time (CT) was 15 seconds. Example 1 was carried out in theabsence of the catalyst.

TABLE 1 Fluorination of HCFC-243db Example HF/243 Temp. No. Ratio (° C.)1243zf 243db 244db 1234yf 245cb 1233xf 1233zd 1234ze 245fa 1  5/1 1400.1 88.4 7.4 0 0 3.9 0 0 0 2 10/1 275 0 0.2 0.6 1.3 4.8 90.0 0 0.7 1.0 320/1 325 0 0 0 19.1 11.4 61.7 2.3 3.1 1.9 4 20/1 350 0 0 0 32.2 8.1 45.34.7 7.9 0.9 5 20/1 400 0 0 0 17.9 6.6 36.3 19.7 14.4 3.6

Example 6 Reaction of CF₃CHClCH₂Cl with HF in the Presence of TaF₅

A 210 mL Hastelloy™ C tube was charged with 10.0 g (0.0599 mole) ofHCFC-243db and 25.4 g (0.040 mole) of tantalum pentafluoride. The tubewas then charged with 40.0 g (2.0 moles) of hydrogen fluoride. The tubewas warmed to 150° C. and held at 149° C. to 150° C. for eight hourswith shaking. The tube was then cooled to room temperature and treatedwith 100 mL of water. The contents of the tube were discharged and asmall organic layer was collected and neutralized. The sample was 91.1%unconverted HCFC-243db; the GC-MS analysis of the converted productswere as follows:

Component GC Area % CF₃CF₂CH₃ 39.3 CF₃CH₂CHF₂ 5.5 C₃H₃ClF₄ 9.2 C₃H₃ClF₄27.6 CF₃CH₂CH₂Cl 2.9 CF₃CCl₂CH₂F 8.6 CF₃CH₂CHCl₂ 6.9

1. A process for making at least one product compound selected from thegroup consisting of CF₃CH₂CHF₂, CF₃CH═CHF and CF₃CH═CHCl, comprising:reacting at least one starting material selected from the groupconsisting of halopropanes of the formula CX₃CHClCH₂X, halopropenes ofthe formula CX₃CCl═CH₂, and halopropenes of the formula CX₂═CClCH₂X,wherein each X is independently selected from the group consisting of Fand Cl, with HF in a reaction zone, optionally in the presence of afluorination catalyst, to produce a product mixture comprising HF, HCl,CF₃CH₂CHF₂, CF₃CH═CHF and CF₃CH═CHCl, wherein the molar ratio of HF tototal amount of starting material fed to the reaction zone is at leaststoichiometric; and recovering said at least one product compound fromthe product mixture.
 2. The process of claim 1 wherein CF₃CH═CHF isrecovered.
 3. The process of claim 2 wherein CF₃CH₂CHF₂ from the productmixture is dehydrofluorinated to produce additional CF₃CH═CHF.
 4. Theprocess of claim 1 wherein CF₃CH═CHCl from the product mixture isfluorinated to produce at least one of CF₃CH₂CHF₂ and CF₃CH═CHF.
 5. Theprocess of claim 1 wherein CF₃CH₂CHF₂ is recovered.
 6. The process ofclaim 1 wherein the product mixture further comprises CF₃CF═CH₂; andwherein CF₃CF═CH₂ from the product mixture is recovered.
 7. The processof claim 1 wherein the product mixture further comprises CF₃CF₂CH₃; andwherein a mixture of CF₃CF₂CH₃ and CF₃CH═CHF is recovered and furtherreacted with HF in the liquid phase under fluorination conditions in thepresence of a fluorination catalyst to produce a mixture comprisingCF₃CH₂CHF₂ and CF₃CF₂CH₃.
 8. The process of claim 1 wherein the productmixture further comprises CF₃CF₂CH₃; and wherein a mixture of CF₃CF₂CH₃and CF₃CH═CHF is recovered and further reacted under dehydrofluorinationconditions in the presence of a dehydrofluorination catalyst to producea mixture comprising CF₃CH═CHF and CF₃CF═CH₂.
 9. The process of claim 1wherein CF₃CH₂CHF₂, CF₃CH═CHF and CF₃CH═CHCl from the product mixturetogether with CF₃CF₂CH₃, CF₃CF═CH₂ and CF₃CCl═CH₂ from the productmixture, if present, are further reacted with HF in the liquid phaseunder fluorination conditions in the presence of a fluorination catalystto produce a mixture comprising CF₃CH₂CHF₂ and CF₃CF₂CH₃.
 10. Theprocess of claim 9 wherein CF₃CH₂CHF₂ and CF₃CF₂CH₃ from the mixture isdehydrofluorinated to produce both CF₃CH═CHF and CF₃CF═CH₂; and whereinboth CF₃CH═CHF and CF₃CF═CH₂ are recovered.
 11. The process of claim 1wherein the product mixture further comprises CF₃CCl═CH₂; and whereinthe CF₃CCl═CH₂, CF₃CH₂CHF₂ and CF₃CH═CHCl from the product mixture arefurther reacted with HF in the liquid phase under fluorinationconditions in the presence of a fluorination catalyst to produce amixture comprising CF₃CH₂CHF₂ and CF₃CF₂CH₃.
 12. The process of claim 1wherein the starting material is reacted in the vapor phase in thepresence of a fluorination catalyst.
 13. The process of claim 12 whereinthe fluorination catalyst comprises at least one chromium-containingcomponent selected from the group consisting of crystallinealpha-chromium oxide where from about 0.05 atom % to about 6 atom % ofthe chromium atoms in the alpha-chromium oxide lattice are replaced bytrivalent cobalt atoms, and crystalline alpha-chromium oxide where fromabout 0.05 atom % to about 6 atom % of the chromium atoms in thealpha-chromium oxide lattice are replaced by trivalent cobalt atomswhich has been treated with a fluorinating agent.
 14. A process formaking at least one product compound selected from the group consistingof CF₃CF₂CH₃ and CF₃CF═CH₂, comprising: reacting at least one startingmaterial selected from the group consisting of halopropanes of theformula CX₃CHClCH₂X, halopropenes of the formula CX₃CCl═CH₂ andhalopropenes of the formula CX₂═CClCH₂X, wherein each X is independentlyselected from the group consisting of F and Cl, with HF in a reactionzone, optionally in the presence of a fluorination catalyst, to producea product mixture comprising HF, HCl, CF₃CF₂CH₃ and CF₃CF═CH₂, whereinthe molar ratio of HF to total amount of starting material fed to thereaction zone is at least stoichiometric; and recovering said at leastone product compound from the product mixture.
 15. The process of claim14 wherein the starting material comprises CF₃CCl═CH₂.
 16. A compositioncomprising: (a) CF₃CCl═CH₂, and (b) HF; wherein the HF is present in aneffective amount to form an azeotropic combination with the CF₃CCl═CH₂.17. A composition comprising: (a) CF₃CF₂CH₃, and (b) HF; wherein the HFis present in an effective amount to form an azeotropic combination withthe CF₃CF₂CH₃.